First off I did a lot of searching (11 pages to be exact) but didn't find my answer.

I'm hoping someone can help me here.

In Hamilton county Tennessee they do emissions testing yearly (mainly to get the $10 off folks). Anything 95 and above that has the OBDII port they just plug into it and then look underneath to make sure you have a cat - no sniff test. Older cars get the mirror treatment and sniff test.

I'm not sure how they do diesels, hoping it's just a port scan too, but I'm wondering if that's all it is - would a tuned truck pass? Has anyone gone through and passed without resetting back to stock? I'm not sure what all gets scanned but I was wondering if the Spartan or the other tuners will show everything being "A okay" as far as the scan tool is concerned.

Doesn't matter... I believe all they are looking for is a P1000 DTC, or any other codes.

They may check readiness monitors, but if you read the sticker on the valve cover, I believe it says something to the effect of "May not meet all OBDII requirements". So basing an emissions test off of OBDII information obtained from the vehicle may be a moot point.

Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.

I just went through it in February and had to put the stock exhaust etc. back on to get my Mass Inspection Sticker. My dealer ran it through the state scanner before I tried it for real and it failed - we got a "Catalyst Not Ready" error and an "EGR Not Ready" error which translates to "FAIL" in Massachusetts. Hope that helps...

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